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Syllabus

what is the meaning of quantisation of charge?

Two point charges q

_{2}= 3 x 10^{-6}C and q_{1}= 5 x 10^{-6}C are located at (3 ,5,1,) and (1,3,2) m .find F12and F

_{21}using vector form of coulomb 's law . Also, find their magnitude._{0}?ABC is an equilateral triangle of side 10m and D is the mid point of BC . Charges of +100 , -100 and +75 micro C are placed at B , C and D respectively . Find the force on +1 micro C charge placed at A.

Difference between gravitational force and electrostatic force

^{6 }Nm^{2}/C.No links plswhat is the dimensional formula of epsilon not?

Two similarly and equally charged identical metal spheres A and B repel each other with a force of 0.000002 N. A third identical sphere C is touched with A and then placed at the mid point between A nd B. What is the net electric force on C?

t= r/2 introduced between the charges,the coulomb repulsive force is reduced in the ratio 9:4 .the dielectric constant of slab is?

Three point charges of +2 microcoulomb,-3 microcoulomb and -3 microcoulomb are kept at the vertices A,B and C respectively of an equilateral triangle of side 20 cm.What should be the sign and magnitude of the charge to be placed at the mid point(M) of side BC so that the charge at A remains in equilibrium?

A charge q is placed at the center of the line joining two equal charges Q. Show that the system of three charges will be in equilibrium if q = -Q/4.

derive an expression for potential energy of an electric dipole in a uniform electric field .

An infinite number of charges each equal to q are placed along x axis at x=1 , x=2 , x=4, x=8 and so on . Find the electric field at the point where x=0 due to this setup of charges and what will be the electric field if inthe above setup the consecutive charges have opposite sign.?

Four charges are placed on corners of a square ABCD, A = Q, B = -2Q, C = +2Q & D = -Q having side of 5cm. If Q is one microcoulomb, then electric field intensity at centre will be

a) 1.02 x 10

^{7}N / C upwardsb) 2.04 x 10

^{7}N / C downwardsc) 2.04 x 10

^{7}N / C upwardsd) 1.02 x 10

^{7}N / C downwardsa gas is heated through 1 degree celsius in a closed vessel. its pressure is increased by 0.4%.the initial temperature of the gas is ????

difference between uniform and non-uniform electric fields.... plzz if possible draw diagrams too..!

What will be the value of electric field at the centre of electric dipole?(a)Zero

(b)Equal to the electric field due to one charge at centre

(c)Twice the electric field due to one charge at centre

(d)half the value of electric field due to one charge at centre.

A charge "q" is placed at the centre of the cube of side "l". What is the electric flux passing through each face of the cube?

what does q1+q2 =0 signify in electrostatics?

Pls provide chart for values of Sin, Cos, Tan and Cot for specific values from 30 degrees to 360 degrees.

What is quantisation of charge?

radius of first orbit=0.5 angstrom

What are the limitations of Coulomb's Law ?

Four charges, each equal to Q are placed at the 4 corners of a square and a charge q is placed at the centre of the square. If the system is in equilibrium, then the value of q is?

21. For a dipole, the value of each charge is 10

^{-10}stat coulomb and separation of 1A, then its dipole moment is :(1) One debye (2) 2 debye (3) 10

^{-3}debye (4) 3 x 10^{-20}debyeA pendulum bob of mass of 80 mg and carrying a charge of 2 X 10

^{-}^{8}C is at rest in a horizontal uniform electric field of 20,000 V/m. Find the tension in the thread of the pendulum and the angle it makes with the vertical.Take( g = 9.8ms

^{-2})Three charges each equal to q are placed at the three corners of a square of side a. Find the electric field at the fourth corner.

two equal point charges A and B are R distance apart. A third point charge placed on the prependicular bisector at a distance 'd' from the center will experience maximum electrostatic force when

1. d = R/2 X 1.414

2 d = R/ 1.414

3. d = R 1.414

4. d = 2 X 1.414 R

24. A block of mass 3kg is connected with two identical massless springs A and B and a block mass 2kg is hanging with a third identical spring C as shown in figure then the magnitude of acceleration of 3kg and 2kg block just after cutting the spring A

when a body becmes negatively charged , its mass

[a] decreases [b] increases

[c] remins the same [d] none of these

if 10^14 electrons are removed from a neutral metal sphere, then what is the charge on the sphere?

q. Two point charges of +16 micro coulomb and -9 micro coulomb are placed 8 cm apart in air .Determine the position of the point at which the resultant field is zero .

Two small balls having equal positive charge q coulomb are suspended by two insulating strings of equal length ' l ' meter from hook fixed to stand.The whole setup is taken in a satellite into sapce where there is no gravity. What is the angle between the two strings and the tension in each string?

an electric dipole of dipole moment 20 *10

^{-6}Cm is enclosed by a closed surface .what is the net flux coming out of the surface?2 point charges at distance ' r ' in air exert a force ' F ' on each other, at what distance will these charges experience the same force ' F' in a medium of dielectric constant K?

1.Suppose an attractive nuclear force acts between two protons which may be written as F=Ce

^{_kr/r square}. (a) Write down the dimensional formulae and appropriate SI units of C and k. (b)Suppose that k=1 fermi^{-1}and that the repulsive electric force between the protons is just balanced by the attractive nuclear force when the separation is 5fermi . Find the value of Ctwo fixed point charges +4e and +e units are separated by a distance a .where should the third point charge be placed for it to be in equilibrium ?

how much positive and negative charge is there in a cup of water

Two infinitely long parallel wires having linear charge densities λ1 and λ2 respectively are placed at a distance of R metre. The force per unit length on either wire will be.......?

what is the principle of vernier calipers

2 extremely small charged copper spheres have their centres separated by a distance of 50cm in vacuum.what is the force of repulsion if the two spheres are placed in water? charge on each sphere is 6.5X10 to the power -7 C

_{1}, Q_{2}, Q_{3}, respectively. It is found that the surface charge densities on the outer surfaces of the shells are equal. Then, the ratio of the charges given to the shells, Q_{1}: Q_{2}: Q_{3}is : (1) 1 : 2 : 3 (2) 1 : 3 : 5 (3) 1 : 4 : 9 (4) 1 : 8 : 18electrostatic field lines cannot be discontinuous why?

A liquid drop having 6 excess electrons is kept stationary under uniform electric field of25.5 kV m

^{-1}The densilty of liquid is1.26 x 10^{3}kg m^{ -3 }The radius of the drop is :^{}^{}state Gauss' law in electrostatics.

_{x}= 5 A x+ 2 B where E is in NC^{-1 }and x in meter , A and B are constants with dimensions . taking A = 10 N C^{-1}m^{-1}and B = 5 NC^{-1}, calculate (i) the electric flux through the cube (ii) net charge enclosed within the cubeAn electron falls through a distance of 1.5 cm in a uniform electric field of magnitude 2.0 × 10

^{4}N C^{–1}in the direction of the field . Then the direction of the field is reversed keeping its magnitude unchanged and a proton falls through the same distance . compute the time of fall in each case.ncert example 1.7 phy class 12 part 1

pg 18

how F3=(3)^1/2 F

project to study various factors on which the internal resistance emf of a cell depends

Find (i) the force on the charge at the centre of shell and at the point A. (ii) the electric flux through the shell.

State and prove

.Gauss TheoremA free proton and a free electron are placed in a uniform field. Which of the two

experience greater force and greater acceleration?

what are the physical significance of electric field??

estimate the total number of electrons present in 100g of water. how much is the total negative charge carried by these electrons? A vogadro's number =6.02*10 to the power 23 and molecular mass of water= 18.

What is the angle between the directions of electric field at any 1) axial point 2) equatorial point due to an electric dipole ?

a semi infinite line charge of linear charge density 'D' has the shape of an infinitely long straight wire whose one end is connected to three-fourth circle of radius 'R' while one of the diameters of 3/4th circle is parallel to the infinitely long straight part.What is the field at the centre of the circle.How?

the sum of two point charges is 7uC. they repel each other with a force of 1N when kept 30cm apart in free space. calculate the value of each charge.

(1) $\frac{1}{4{\mathrm{\pi \epsilon}}_{0}}\frac{\mathrm{q}}{3\sqrt{3}{\mathrm{R}}^{2}}$ (2) $\frac{{\displaystyle 1}}{{\displaystyle 4{\mathrm{\pi \epsilon}}_{0}}}\frac{{\displaystyle 2\mathrm{q}}}{{\displaystyle 3{\mathrm{R}}^{2}}}$ (3) $\frac{{\displaystyle 1}}{{\displaystyle 4{\mathrm{\pi \epsilon}}_{0}}}\frac{{\displaystyle 2\mathrm{q}}}{{\displaystyle 3\sqrt{3}{\mathrm{R}}^{2}}}$ (4) $\frac{{\displaystyle 1}}{{\displaystyle 4{\mathrm{\pi \epsilon}}_{0}}}\frac{{\displaystyle 3\mathrm{q}}}{{\displaystyle 2\sqrt{3}{\mathrm{R}}^{2}}}$

explain cyclotron in a more elaborate way

Q. Three point masses, M each, are moving in a circle, each with a speed v, under their mutual gravitational attractive force. The distance between any two masses must be :

(A) 2 GM/${v}^{2}$

B) 3 GM/${v}^{2}$

C) GM$\sqrt{3}$/${v}^{2}$

D) GM/${v}^{2}$

If E=6i+3j+4k, calculate the electric flux through a surface of area 20 units in the YZ plane.

HOW TO DO THIS QUESTION?

The electric field components due to a charge inside the cube of side 0.1 m are as shown:

Where α = 500 N/C − m

E_{y}= 0,E_{z}= 0Calculate (i) the flux through the cube and (ii) the charge inside the cube

A certain charge Q is divided into two parts q and Q-q which are then seperated by a certain distance.What must q be iin terms of Qto maximise the electrostatics repulsion between the two charges?

what is the source charge and test charge

Explain the formulae E = Sigma / Epsilon not.

E is the electric field vector.

Epsilon not is the specific inductive capacity or relative permittivity of vaccum.

Sigma = ? (doubt)

a car moving with a speed of 40km/hr can be stopped by applying brakes after at least 2m.If the same car is moving with 80km/hr.What is the least stopping distance?

Why does the electric field inside a dielectric decrease when it is placed in an external electric field?

how does coulomb force between two point charges depend upon the permitivity of the intervening medium ?

Q2. A large vessel of height H, is filled with a liquid of density $\mathrm{\rho}$, upto the brim. A small hole of radius r is made at the side vertical face, close to the base. The horizontal force is required to stop the gushing of liquid is

(1) $2\left(\mathrm{\rho gH}\right){\mathrm{\pi r}}^{2}$ (2) $\mathrm{\rho gH}$

(3) $\mathrm{\rho gH}$$\mathrm{\pi r}$ (4) $\mathrm{\rho g}$$\mathrm{\pi r}$

^{2}